Improvement in head-blocks



-Toull'whom 'it concer-au' pren, county` `invented om `a full, eleair"`to th e,

rorPLE, WAnnnN, PENNSYLVANIA.

.letters Patent nd; 115,231,11atea May`2a1s71.

" mwncavslnIsn-rI In HEAD-stocks.

` sensuele xermesfug m than imminent@ 'pm et en eme.

1 Be it` known `that-I, Hman; vPor Ln, of War-.-l

otwarren, State `of Pennsylvania, have in|1ewand usefulv Improvements inor SawfMills, of which thefollowingis ,rnd exact description, referencebeing had acconpanying drawing making part of this Hannelorespeciiicatiomin which-f.V

u Fgnrel is'a perspective view of my improved head'- block; I l, `Figure2 `is alplln or top viewLof the same; and

"Figure 3 isavertical longitudinalsection on line y .y,;ng. e.` i

` imlar letters ofreference denote-corresponding partsginall`thewiignres- The inventionV relates tothat class of head-blocks inwhioh'the loggcant or timber is dogged to and fed forwardbykvertieal'knees which rest upon"ways.l

pnrpose,"'afslotted vdog,jwhich recprncates on a 'gh xe, issupportedagainst` lateral othrusthy the allsfiot'thelltueeindependently oi',` thepills ou which it slides; is, 4when "withdrawn from the log, protectedby the shellfof the knee, and "is voperated by a lever andulink in suchmannen that when .it (the dog) is withdrawn it` is `lo'ek'edfin"position'.bythe -lever and l link referred to.

' Thefsecondf'part ofthe invention` consists in com.

` fbining-with'the..headyblock, upon-which knees move,.azgraduatcdaoradj ustablestop, or seres'of stops, for- 'regulating the`point to which the knees shall be with- 1 drawn,; in 'order thatthe-knees may be drawn back just a"jproper `distanceto receivea log-cantof any given size.; and this vpart of the' invention further con;sist-s,v in operating thisf adjustable stop or gauge by means of anindex-wheel, constructed in suchV manner that the operator can` readilydetermine the distance `.wl'1ich the kneescan`bewithdrawnaudcouseqneutly the sized logthatcan be` accommodated.

"1 The third pai-trof the invention consists in a novel l .lconstruction' of the `doublererank-wheel, by which it is made toscrve,iii-.combination with a stop, to limit the motion oi' "the pawls `which`carry the log forward. `intheaccompanying drawing. C A. Arcpresent-thebody `or bed of the head-block,

f l `runde preferablyinjtwo parts, asindicated in flgsfl 4and. 2, andbolted or otherwise secured together.

,"lhis part vof the head-block is made substantially inthetnsualmanner,` except that it is provided upon Mitsv upper` face witha doubletrack, or twoindependent mackathe upper one, 1A' A',lbeing the broadest,and l intendodgto `receive,will Support the log, while the ,l'oweronfgwhich" is formed inthis instance by simply Vrabbeting v.the inner edgesof tracks A', as is `shown plainly at a, iig. 1, is intended to supportthe knee B.

' usually adopted in this class of blocks, and is'constructed with agroove extending along each side near its lower face, these groovesreceiving the waysv a. Y The vertical portion of the knee is recessed orchambered, as at b, iig. 3, for the reception of the-toothed dog C.

The dog Gis provided with slots c, iig. 3, which through the chamber b.Thev slots c are not parallel with the outer-face of so'that when thedogis thrust downwardl from the `position in which it is shown, it is atthe same time brought forward, as will be readily understood without`further explanation.

C isa hand-lever, pivoted to the vertical portion of the head-block, andconnected with the dog O by link `spur project-ing from the dog thmugh aslot,.c, this with theinclination of the slot c in the dog.

dog or` hook used for dogging the log-in the usual F Fx are twotongueesprings, attached to any con- IE for the purposeof holding saidpawls in contact with the ratcheted face of the knee B. l

and allowing the'knee to be drawn back;| I employ a, tripping cam-shaft,f, or a shaft with` a projecting lip, and operate this shaft by a wheel,Il, or a. crank, F, iig. 0

gears gf h, gear. h. being mounted upon shaft H, which inclose suitablepins projecting from or extending4 slot being inclined from a verticalline'to'coi'respond l manner, as tbe dog C is intended more particularlyto be, used when-sawing the last board, when it is necesy For thepurpose of throwing the pawls out of actionA ,'flg. an a shaft munies insuit-able bearings at the side of the ,bed A A, and rotated by thebevel- The kneeB is made substantially in the form A 'the knee, bn't areinclined, as shown in the drawing, v

c, the lower end of thislink being .connected to a- D. isa staple oreye, to-which is hingedan ordinary e1, andthus limit the throw ofvenient part of the head-block in 'such position that their free endsengage with the lower sides of pawlsr knee B. near or at the verticaltin of the stop e, which 'is arranged .transversely of the hcadfbloclr,and operated by hand-wheel H'. This hand-wheel .has a series ol'nnmbersstamped upon its periphery, as shown in iitgt. 2, the object ofavhichwill hev fully explaiuedherea er. g g are short studs4 attached to orformednpon shaft G.- They are placed spilally ou thel shaft, and extendfrom its i'ont endvsnch distance toward the other end as may be founddesirable. Y I is an arln or plate attached to the lower side of part,and extending across the face of way or Ltrack A', and is bent down'4 atabout a right angle, so that its cnd will engagewith the stopsor stads gon -shaft'G, thus limiting the backward movement of the knee.

-J is a spring pawl, which takes into n hgroores ont in theperlpheralface of wheel H.

These notches are out at auch intervals that when the wheel is movedfrom one notch to anotherx he shaft G will be turned ihr enough to turnthe ext f stud to the upper side of the shaft, so that the arm I maypass by the stud which han. just been turned to one side,- and strikeagainst the one which I have just descri d asi having been turned up.

-ln mating my head-block 1 lirst set the sha; G at such point as willallow the. knee to be withdrawn far enough to admit the log, thispoint'beng indicated by the figures on the rim ot hand-wheel H', theybcing so arranged, relative to studs' or stops g, that they willdesignate which stop is turned up, and consequently how far liack theknee can be moved. The logy is now placed on the carriage and secured.by the dogs, as is customary in this class of headblocks,.aml fedforward hy means ofthe pawls E in a manner which is well um lstood andneed not be pal'- ticularly described, e I in reference to theoperacngages with the shoulders c c' on clank-wheel E, and thus limitsthe brward movement of the knee B, and itis apparent that by using astop which shall lill up a greater portion of' the space between theseshoulders, the throw of the lever at each' reciprocation, and theconsequent ad` vance of the log toward the saw, can be regulated atthe'will of the operator.

Of course, in feeding the log forward, the position of thetripping-shaft a' should be that shown in the draw- "hand-wheel H',substantially as described.

v naar:

tion will be found very eiective for vthat purpose, as

the direct motion on a. right line is better adapted to give the jaws ofthe dog a firm hold than is the nlvement in an arc'of a circle Vwhichothers have; and then again, under my arrangement of parts, the weightof the lever and link tends toholdthe dog .iu place, iustead of to drawitout.

I do not claim, broadly, the slotted dog 0, as that. is admitted toheold; but I believe that my combination and arrangement of pants arenew. y

I am aware that head-bloeks have been constructed with a doublecrank-wheel by means of which the pawls were actuated, and that in thisconstruction there was a eolleton the crank-wheel shaft, said colletengaging with stops to limit the throw of the pawls; therefore I do notclaim, broadly, the use of the double crank-wheel, nor of stops to limitits throw, but only claim mine as an improvement upon the consti" t o"referred to. p Having now described my invention,

What I claim as new, and desire to secure by Letters Patent, is-

1; In combination with the hollow knee B, the slotted dog U, arrangedwithin the walls of the knee, and operated by the lever C' and link c,as described.

2. The shaft G, provided with the spiral row of studs g, in combinationwith the knee B, as set forth,

3. The combination of shafts G H, gears 4. The crank-wheel E, providedwith shoulders e e, in combination with pawls E, shaft E', and stop e,when these parts are constructed and arranged forjoint operation, asdescribed.

HIRAM M. POPPLE.

Witnesses: A. H. McKnLoY,

J. G. Ovens.

g h, and

